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-rw-r--r--arch/powerpc/kernel/dbell.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
index 5b25c80..a892680 100644
--- a/arch/powerpc/kernel/dbell.c
+++ b/arch/powerpc/kernel/dbell.c
@@ -28,6 +28,8 @@ void doorbell_setup_this_cpu(void)
void doorbell_cause_ipi(int cpu, unsigned long data)
{
+ /* Order previous accesses vs. msgsnd, which is treated as a store */
+ mb();
ppc_msgsnd(PPC_DBELL, 0, data);
}